Siemens 6SE6440-2UD25-5CA1 MICROMASTER 440 – High-Performance AC Variable Frequency Drive | MICROMASTER 440 Series
Engineering Background
The MICROMASTER 440 (MM440) is Siemens’ flagship general-purpose variable frequency drive platform, engineered for demanding industrial motor control applications. The 6SE6440-2UD25-5CA1 variant delivers 5.5 kW output power with a 3-phase 380–480 V AC input, making it the preferred choice for pump, fan, compressor, and conveyor drive systems where precise speed regulation and energy efficiency are mission-critical.
Product Positioning
Designed for procurement engineers and system integrators who require a proven, globally certified AC drive with advanced vector control, comprehensive fieldbus compatibility, and a robust protection feature set. The MM440 platform is fully supported by Siemens’ global service network and is a direct replacement or upgrade path for legacy MICROMASTER 420/430 installations.
Complete Technical Specifications
| Part Number / SKU | 6SE6440-2UD25-5CA1 |
| Series | MICROMASTER 440 (MM440) |
| Manufacturer | Siemens AG |
| Output Power | 5.5 kW (7.5 HP) |
| Input Voltage | 3-Phase 380–480 V AC (±10%) |
| Input Frequency | 47–63 Hz |
| Output Voltage | 0 V to Input Voltage |
| Output Frequency | 0–650 Hz |
| Rated Output Current | 13.2 A (CT) / 16.5 A (VT) |
| Overload Capacity | 150% for 60 s (CT); 110% for 60 s (VT) |
| Control Mode | V/f, Flux Current Control (FCC), Sensorless Vector (SLVC), Closed-Loop Vector (VC) |
| Protection Class | IP20 (built-in); IP54/55 with optional filter |
| Ambient Temperature | -10°C to +50°C (derating above 40°C) |
| Storage Temperature | -40°C to +70°C |
| Humidity | ≤95% RH, non-condensing |
| Altitude | Up to 1000 m (derating above) |
| Braking | DC braking; Dynamic braking (external resistor) |
| Digital Inputs | 6 × programmable DI (PNP/NPN) |
| Analog Inputs | 2 × AI (0–10 V / 0–20 mA / 4–20 mA) |
| Digital Outputs | 3 × relay outputs (30 V DC / 250 V AC, 2 A) |
| Analog Outputs | 2 × AO (0–20 mA) |
| Serial Communication | RS-485 (USS protocol); PROFIBUS DP (optional CB) |
| Fieldbus Options | PROFIBUS DP, DeviceNet, CANopen, Modbus RTU (via option board) |
| Dimensions (H×W×D) | 275 × 185 × 195 mm |
| Weight | Approx. 5.5 kg |
| Certifications | CE, UL, cUL, C-Tick |
| Cooling | Forced air cooling (integrated fan) |
| EMC Filter | Class A integrated (Class B optional) |
Proven Application Environments
- Pump & Fan Control: Variable torque loads with energy-saving quadratic V/f characteristic
- Conveyor & Material Handling: Constant torque applications with precise speed ramp control
- Compressor Drives: Smooth start/stop with configurable acceleration/deceleration ramps
- HVAC Systems: Building automation integration via PROFIBUS or Modbus RTU
- Machine Tool Spindles: High-frequency output up to 650 Hz for spindle applications
- Water Treatment Plants: Multi-pump control with PID feedback loop
- Textile & Printing Machinery: Synchronised multi-axis speed control
Engineering Advantages
- Advanced Vector Control: Sensorless and closed-loop vector modes deliver ±0.5% speed accuracy without encoder feedback
- Kinetic Buffering: Maintains drive operation during brief mains supply interruptions
- Comprehensive Protection: Over-voltage, under-voltage, over-current, over-temperature, ground fault, and motor stall protection built-in
- Flexible I/O: 6 DI + 2 AI + 3 relay DO + 2 AO enables complex control architectures without external modules
- Integrated PID Controller: Closed-loop process control without external PLC for simple applications
- Parameter Cloning: BOP/AOP operator panel enables rapid parameter upload/download for fleet commissioning
- Wide Fieldbus Ecosystem: Native USS + optional PROFIBUS DP, DeviceNet, CANopen, Modbus RTU
System Architecture & Signal Flow
The 6SE6440-2UD25-5CA1 accepts 3-phase 380–480 V AC mains input through an integrated EMC filter and rectifier stage, producing a stable DC bus voltage. The IGBT-based inverter stage synthesises a variable-frequency, variable-voltage output via PWM modulation (default 4 kHz, adjustable 2–16 kHz). The control board executes the selected control algorithm (V/f / FCC / SLVC / VC) at a 1 ms cycle time, with setpoint input accepted via analog reference, USS serial command, or fieldbus telegram. Motor feedback (speed/torque) is processed through the closed-loop vector controller when an encoder is fitted. All protection events are logged to a fault history buffer accessible via BOP or STARTER software.
Sourcing & Quality Verification
- OEM Origin: Sourced directly from Siemens-authorised distribution channels; all units carry original Siemens holographic labels and date codes
- Inspection Protocol: Each unit undergoes incoming inspection including visual check, label verification, and power-on functional test before dispatch
- Warranty: 12-month Konmask quality warranty covering manufacturing defects; Siemens OEM warranty terms apply where applicable
- Counterfeit Prevention: Serial number verification available upon request; we provide full traceability documentation
- Condition: New-in-box (NIB) unless explicitly stated as refurbished/surplus in the listing title
Procurement Process
- Confirm Part Number: Verify 6SE6440-2UD25-5CA1 against your BOM or Siemens order code decoder
- Request Quote: Contact support@konmask.com with quantity and required delivery date for volume pricing
- Order Placement: Purchase via this listing or submit a PO to our sales team
- Lead Time: In-stock units ship within 1–3 business days; ETA confirmation provided at order
- Shipping: DHL Express / FedEx International Priority with full tracking and commercial invoice
- Documentation: Packing list, commercial invoice, and certificate of conformity included; ECCN/HTS codes available on request
Technical FAQ
Q: Is the 6SE6440-2UD25-5CA1 compatible with single-phase input?
A: No. This unit requires 3-phase 380–480 V AC input. For single-phase applications, refer to the MICROMASTER 420 series.
Q: What motor types are supported?
A: Standard asynchronous (induction) motors. Permanent magnet synchronous motors (PMSM) are not natively supported on MM440.
Q: Can I connect this drive to a Siemens S7 PLC via PROFIBUS?
A: Yes, with the optional PROFIBUS DP communication board (6SE6400-1PB00-0AA0). USS protocol over RS-485 is available natively.
Q: What is the difference between CT and VT ratings?
A: CT (Constant Torque) = 13.2 A rated for conveyor/compressor loads with 150% overload. VT (Variable Torque) = 16.5 A rated for pump/fan loads with 110% overload.
Q: Is an external EMC filter required?
A: An integrated Class A EMC filter is standard. For Class B (residential/light industrial) compliance, an external filter is required.
Q: What programming software is used?
A: Siemens STARTER or SCOUT TIA (via DRIVE-CLiQ adapter) for advanced commissioning. Basic parameter setting via BOP (Basic Operator Panel) or AOP (Advanced Operator Panel).
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